21242131111444 has 12 divisors (see below), whose sum is σ = 37173966605524. Its totient is φ = 10620997795584.

The previous prime is 21242131111427. The next prime is 21242131111459. The reversal of 21242131111444 is 44411113124212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7836427607044 + 13405703504400 = 2799362^2 + 3661380^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16231389 + ... + 17491204.

Almost surely, 2^{21242131111444} is an apocalyptic number.

It is an amenable number.

21242131111444 is a deficient number, since it is larger than the sum of its proper divisors (15931835494080).

21242131111444 is a wasteful number, since it uses less digits than its factorization.

21242131111444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33880074 (or 33880072 counting only the distinct ones).

The product of its digits is 6144, while the sum is 31.

Adding to 21242131111444 its reverse (44411113124212), we get a palindrome (65653244235656).

The spelling of 21242131111444 in words is "twenty-one trillion, two hundred forty-two billion, one hundred thirty-one million, one hundred eleven thousand, four hundred forty-four".